2816809 has 2 divisors, whose sum is σ = 2816810. Its totient is φ = 2816808.

The previous prime is 2816777. The next prime is 2816819. The reversal of 2816809 is 9086182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2111209 + 705600 = 1453^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 2816809 - 2⁵ = 2816777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2816819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1408404 + 1408405.

It is an arithmetic number, because the mean of its divisors is an integer number (1408405).

2^2816809 is an apocalyptic number.

It is an amenable number.

2816809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2816809 is an equidigital number, since it uses as much as digits as its factorization.

2816809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2816809 is about 1678.3351870231. The cubic root of 2816809 is about 141.2274550908.

The spelling of 2816809 in words is "two million, eight hundred sixteen thousand, eight hundred nine".